Gold glow of chestnut (6)
I believe the answer is:
auburn
'chestnut' is the definition.
(thesaurus)
'gold glow' is the wordplay.
'gold' becomes 'au' (Au is the chemical symbol for gold).
'glow' becomes 'burn' ('burn' can be a synonym of 'glow').
'au'+'burn'='AUBURN'
'of' is the link.
(Other definitions for auburn that I've seen before include "Golden" , "Reddish-brown, hair say" , "Name of Goldsmith's deserted village (6)" , "Shade of brown" , "Of hair colour, reddish brown (6)" .)